Data commit

Task/Yin-and-yang/Python/yin-and-yang-1.py

@@ -0,0 +1,21 @@
+import math
+def yinyang(n=3):
+	radii   = [i * n for i in (1, 3, 6)]
+	ranges  = [list(range(-r, r+1)) for r in radii]
+	squares = [[ (x,y) for x in rnge for y in rnge]
+		   for rnge in ranges]
+	circles = [[ (x,y) for x,y in sqrpoints
+		     if math.hypot(x,y) <= radius ]
+		   for sqrpoints, radius in zip(squares, radii)]
+	m = {(x,y):' ' for x,y in squares[-1]}
+	for x,y in circles[-1]:
+		m[x,y] = '*'
+	for x,y in circles[-1]:
+		if x>0: m[(x,y)] = '·'
+	for x,y in circles[-2]:
+		m[(x,y+3*n)] = '*'
+		m[(x,y-3*n)] = '·'
+	for x,y in circles[-3]:
+		m[(x,y+3*n)] = '·'
+		m[(x,y-3*n)] = '*'
+	return '\n'.join(''.join(m[(x,y)] for x in reversed(ranges[-1])) for y in ranges[-1])

Task/Yin-and-yang/Python/yin-and-yang-2.py

@@ -0,0 +1,53 @@
+from turtle import *
+
+mode('logo')
+
+def taijitu(r):
+  '''\
+  Draw a classic Taoist taijitu of the given radius centered on the current
+  turtle position. The "eyes" are placed along the turtle's heading, the
+  filled one in front, the open one behind.
+  '''
+
+  # useful derivative values
+  r2, r4, r8 = (r >> s for s in (1, 2, 3))
+
+  # remember where we started
+  x0, y0 = start = pos()
+  startcolour = color()
+  startheading = heading()
+  color('black', 'black')
+
+  # draw outer circle
+  pendown()
+  circle(r)
+
+  # draw two 'fishes'
+  begin_fill(); circle(r, 180); circle(r2, 180); circle(-r2, 180); end_fill()
+
+  # black 'eye'
+  setheading(0); penup(); goto(-(r4 + r8) + x0, y0); pendown()
+  begin_fill(); circle(r8); end_fill()
+
+  # white 'eye'
+  color('white', 'white'); setheading(0); penup(); goto(-(r+r4+r8) + x0, y0); pendown()
+  begin_fill(); circle(r8); end_fill()
+
+  # put the turtle back where it started
+  penup()
+  setpos(start)
+  setheading(startheading)
+  color(*startcolour)
+
+
+if __name__ == '__main__':
+  # demo code to produce image at right
+  reset()
+  #hideturtle()
+  penup()
+  goto(300, 200)
+  taijitu(200)
+  penup()
+  goto(-150, -150)
+  taijitu(100)
+  hideturtle()